LLVM  10.0.0svn
UnicodeCharRanges.h
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1 //===--- UnicodeCharRanges.h - Types and functions for character ranges ---===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 #ifndef LLVM_SUPPORT_UNICODECHARRANGES_H
9 #define LLVM_SUPPORT_UNICODECHARRANGES_H
10 
11 #include "llvm/ADT/ArrayRef.h"
12 #include "llvm/Support/Compiler.h"
13 #include "llvm/Support/Debug.h"
15 #include <algorithm>
16 
17 #define DEBUG_TYPE "unicode"
18 
19 namespace llvm {
20 namespace sys {
21 
22 /// Represents a closed range of Unicode code points [Lower, Upper].
26 };
27 
29  return Value < Range.Lower;
30 }
32  return Range.Upper < Value;
33 }
34 
35 /// Holds a reference to an ordered array of UnicodeCharRange and allows
36 /// to quickly check if a code point is contained in the set represented by this
37 /// array.
39 public:
41 
42  /// Constructs a UnicodeCharSet instance from an array of
43  /// UnicodeCharRanges.
44  ///
45  /// Array pointed by \p Ranges should have the lifetime at least as long as
46  /// the UnicodeCharSet instance, and should not change. Array is validated by
47  /// the constructor, so it makes sense to create as few UnicodeCharSet
48  /// instances per each array of ranges, as possible.
49 #ifdef NDEBUG
50 
51  // FIXME: This could use constexpr + static_assert. This way we
52  // may get rid of NDEBUG in this header. Unfortunately there are some
53  // problems to get this working with MSVC 2013. Change this when
54  // the support for MSVC 2013 is dropped.
55  constexpr UnicodeCharSet(CharRanges Ranges) : Ranges(Ranges) {}
56 #else
57  UnicodeCharSet(CharRanges Ranges) : Ranges(Ranges) {
58  assert(rangesAreValid());
59  }
60 #endif
61 
62  /// Returns true if the character set contains the Unicode code point
63  /// \p C.
64  bool contains(uint32_t C) const {
65  return std::binary_search(Ranges.begin(), Ranges.end(), C);
66  }
67 
68 private:
69  /// Returns true if each of the ranges is a proper closed range
70  /// [min, max], and if the ranges themselves are ordered and non-overlapping.
71  bool rangesAreValid() const {
72  uint32_t Prev = 0;
73  for (CharRanges::const_iterator I = Ranges.begin(), E = Ranges.end();
74  I != E; ++I) {
75  if (I != Ranges.begin() && Prev >= I->Lower) {
76  LLVM_DEBUG(dbgs() << "Upper bound 0x");
77  LLVM_DEBUG(dbgs().write_hex(Prev));
78  LLVM_DEBUG(dbgs() << " should be less than succeeding lower bound 0x");
79  LLVM_DEBUG(dbgs().write_hex(I->Lower) << "\n");
80  return false;
81  }
82  if (I->Upper < I->Lower) {
83  LLVM_DEBUG(dbgs() << "Upper bound 0x");
84  LLVM_DEBUG(dbgs().write_hex(I->Lower));
85  LLVM_DEBUG(dbgs() << " should not be less than lower bound 0x");
86  LLVM_DEBUG(dbgs().write_hex(I->Upper) << "\n");
87  return false;
88  }
89  Prev = I->Upper;
90  }
91 
92  return true;
93  }
94 
95  const CharRanges Ranges;
96 };
97 
98 } // namespace sys
99 } // namespace llvm
100 
101 #undef DEBUG_TYPE // "unicode"
102 
103 #endif // LLVM_SUPPORT_UNICODECHARRANGES_H
uint64_t CallInst * C
This class represents lattice values for constants.
Definition: AllocatorList.h:23
bool operator<(uint32_t Value, UnicodeCharRange Range)
bool contains(uint32_t C) const
Returns true if the character set contains the Unicode code point C.
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory)...
Definition: APInt.h:32
static GCRegistry::Add< CoreCLRGC > E("coreclr", "CoreCLR-compatible GC")
ArrayRef< UnicodeCharRange > CharRanges
raw_ostream & dbgs()
dbgs() - This returns a reference to a raw_ostream for debugging messages.
Definition: Debug.cpp:132
Holds a reference to an ordered array of UnicodeCharRange and allows to quickly check if a code point...
void write_hex(raw_ostream &S, uint64_t N, HexPrintStyle Style, Optional< size_t > Width=None)
#define I(x, y, z)
Definition: MD5.cpp:58
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
UnicodeCharSet(CharRanges Ranges)
Constructs a UnicodeCharSet instance from an array of UnicodeCharRanges.
Represents a closed range of Unicode code points [Lower, Upper].
LLVM Value Representation.
Definition: Value.h:73
#define LLVM_DEBUG(X)
Definition: Debug.h:122